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Table 1.

Extracellular and intracellular acid–base status in eels exposed for at least 6 weeks to water CO2 partial pressures(PwCO2) of approx. 0.8 mmHg (ambient control),15±1 mmHg, 30±1 mmHg or 45±1 mmHg

PwCO2 (mmHg)
Approx. 0.815±130±145±1
a[CO2] (mmol l-113.0±1.6a 41.6±1.6b 59.8±2.6c 74.7±4.0d 
pHa 7.89±0.04a 7.75±0.02a,b 7.63±0.02b 7.57±0.04b 
PaCO2 (mmHg) 3.7±0.3a 17.5±1.3b 35.0±1.7c 47.5±2.9d 
a[HCO3-] (mmol l-112.8±1.5a 40.8±1.6b 58.2±2.6c 72.5±4.1d 
White muscle pHi 7.13±0.05a 7.03±0.02a 7.03±0.05a 7.01±0.03a 
Heart pHi 7.02±0.03a 7.10±0.03a 7.18±0.03a 7.13±0.01a 
PwCO2 (mmHg)
Approx. 0.815±130±145±1
a[CO2] (mmol l-113.0±1.6a 41.6±1.6b 59.8±2.6c 74.7±4.0d 
pHa 7.89±0.04a 7.75±0.02a,b 7.63±0.02b 7.57±0.04b 
PaCO2 (mmHg) 3.7±0.3a 17.5±1.3b 35.0±1.7c 47.5±2.9d 
a[HCO3-] (mmol l-112.8±1.5a 40.8±1.6b 58.2±2.6c 72.5±4.1d 
White muscle pHi 7.13±0.05a 7.03±0.02a 7.03±0.05a 7.01±0.03a 
Heart pHi 7.02±0.03a 7.10±0.03a 7.18±0.03a 7.13±0.01a 

1 mmHg=approx. 0.01316 kPa.

a[CO2], arterial blood total CO2 content; pHa,arterial pH; PaCO2, arterial CO2partial pressure; a[HCO3-], arterial bicarbonate concentration; pHi, intracellular pH.

Values are means ± 1 S.E.M. of six determinations, except for blood acid—base variables, where N=7 at PwCO2 of 30 mmHg and N=5 at PwCO2 of 45 mmHg.

A common superscript indicates no significant difference between groups(P>0.05).

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